CVE-2022-50381 (GCVE-0-2022-50381)
Vulnerability from cvelistv5
Published
2025-09-18 13:33
Modified
2025-09-18 13:33
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: md: fix a crash in mempool_free There's a crash in mempool_free when running the lvm test shell/lvchange-rebuild-raid.sh. The reason for the crash is this: * super_written calls atomic_dec_and_test(&mddev->pending_writes) and wake_up(&mddev->sb_wait). Then it calls rdev_dec_pending(rdev, mddev) and bio_put(bio). * so, the process that waited on sb_wait and that is woken up is racing with bio_put(bio). * if the process wins the race, it calls bioset_exit before bio_put(bio) is executed. * bio_put(bio) attempts to free a bio into a destroyed bio set - causing a crash in mempool_free. We fix this bug by moving bio_put before atomic_dec_and_test. We also move rdev_dec_pending before atomic_dec_and_test as suggested by Neil Brown. The function md_end_flush has a similar bug - we must call bio_put before we decrement the number of in-progress bios. BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 11557f0067 P4D 11557f0067 PUD 0 Oops: 0002 [#1] PREEMPT SMP CPU: 0 PID: 73 Comm: kworker/0:1 Not tainted 6.1.0-rc3 #5 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014 Workqueue: kdelayd flush_expired_bios [dm_delay] RIP: 0010:mempool_free+0x47/0x80 Code: 48 89 ef 5b 5d ff e0 f3 c3 48 89 f7 e8 32 45 3f 00 48 63 53 08 48 89 c6 3b 53 04 7d 2d 48 8b 43 10 8d 4a 01 48 89 df 89 4b 08 <48> 89 2c d0 e8 b0 45 3f 00 48 8d 7b 30 5b 5d 31 c9 ba 01 00 00 00 RSP: 0018:ffff88910036bda8 EFLAGS: 00010093 RAX: 0000000000000000 RBX: ffff8891037b65d8 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000202 RDI: ffff8891037b65d8 RBP: ffff8891447ba240 R08: 0000000000012908 R09: 00000000003d0900 R10: 0000000000000000 R11: 0000000000173544 R12: ffff889101a14000 R13: ffff8891562ac300 R14: ffff889102b41440 R15: ffffe8ffffa00d05 FS: 0000000000000000(0000) GS:ffff88942fa00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000001102e99000 CR4: 00000000000006b0 Call Trace: <TASK> clone_endio+0xf4/0x1c0 [dm_mod] clone_endio+0xf4/0x1c0 [dm_mod] __submit_bio+0x76/0x120 submit_bio_noacct_nocheck+0xb6/0x2a0 flush_expired_bios+0x28/0x2f [dm_delay] process_one_work+0x1b4/0x300 worker_thread+0x45/0x3e0 ? rescuer_thread+0x380/0x380 kthread+0xc2/0x100 ? kthread_complete_and_exit+0x20/0x20 ret_from_fork+0x1f/0x30 </TASK> Modules linked in: brd dm_delay dm_raid dm_mod af_packet uvesafb cfbfillrect cfbimgblt cn cfbcopyarea fb font fbdev tun autofs4 binfmt_misc configfs ipv6 virtio_rng virtio_balloon rng_core virtio_net pcspkr net_failover failover qemu_fw_cfg button mousedev raid10 raid456 libcrc32c async_raid6_recov async_memcpy async_pq raid6_pq async_xor xor async_tx raid1 raid0 md_mod sd_mod t10_pi crc64_rocksoft crc64 virtio_scsi scsi_mod evdev psmouse bsg scsi_common [last unloaded: brd] CR2: 0000000000000000 ---[ end trace 0000000000000000 ]---
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/341097ee53573e06ab9fc675d96a052385b851fa
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/384ef33d37cefb2ac539d44597d03f06c9b8975c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/732cd66ec19a17f2b9183d7d5b7bdb9c39b0776e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/842f222fc42a9239831e15b1fd49a51c546902cb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/91bd504128a51776472445070e11a3b0f9348c90
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/97ce99984be12b9acb49ddce0f5d8ebb037adbb6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ae7793027766491c5f8635b12d15a5940d3b8698
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b5be563b4356b3089b3245d024cae3f248ba7090
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cf06b162f5b6337b688072a1a47941280b8f7110
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd: fix a crash in mempool_free\n\nThere\u0027s a crash in mempool_free when running the lvm test\nshell/lvchange-rebuild-raid.sh.\n\nThe reason for the crash is this:\n* super_written calls atomic_dec_and_test(\u0026mddev-\u003epending_writes) and\n  wake_up(\u0026mddev-\u003esb_wait). Then it calls rdev_dec_pending(rdev, mddev)\n  and bio_put(bio).\n* so, the process that waited on sb_wait and that is woken up is racing\n  with bio_put(bio).\n* if the process wins the race, it calls bioset_exit before bio_put(bio)\n  is executed.\n* bio_put(bio) attempts to free a bio into a destroyed bio set - causing\n  a crash in mempool_free.\n\nWe fix this bug by moving bio_put before atomic_dec_and_test.\n\nWe also move rdev_dec_pending before atomic_dec_and_test as suggested by\nNeil Brown.\n\nThe function md_end_flush has a similar bug - we must call bio_put before\nwe decrement the number of in-progress bios.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000000\n #PF: supervisor write access in kernel mode\n #PF: error_code(0x0002) - not-present page\n PGD 11557f0067 P4D 11557f0067 PUD 0\n Oops: 0002 [#1] PREEMPT SMP\n CPU: 0 PID: 73 Comm: kworker/0:1 Not tainted 6.1.0-rc3 #5\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014\n Workqueue: kdelayd flush_expired_bios [dm_delay]\n RIP: 0010:mempool_free+0x47/0x80\n Code: 48 89 ef 5b 5d ff e0 f3 c3 48 89 f7 e8 32 45 3f 00 48 63 53 08 48 89 c6 3b 53 04 7d 2d 48 8b 43 10 8d 4a 01 48 89 df 89 4b 08 \u003c48\u003e 89 2c d0 e8 b0 45 3f 00 48 8d 7b 30 5b 5d 31 c9 ba 01 00 00 00\n RSP: 0018:ffff88910036bda8 EFLAGS: 00010093\n RAX: 0000000000000000 RBX: ffff8891037b65d8 RCX: 0000000000000001\n RDX: 0000000000000000 RSI: 0000000000000202 RDI: ffff8891037b65d8\n RBP: ffff8891447ba240 R08: 0000000000012908 R09: 00000000003d0900\n R10: 0000000000000000 R11: 0000000000173544 R12: ffff889101a14000\n R13: ffff8891562ac300 R14: ffff889102b41440 R15: ffffe8ffffa00d05\n FS:  0000000000000000(0000) GS:ffff88942fa00000(0000) knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 0000000000000000 CR3: 0000001102e99000 CR4: 00000000000006b0\n Call Trace:\n  \u003cTASK\u003e\n  clone_endio+0xf4/0x1c0 [dm_mod]\n  clone_endio+0xf4/0x1c0 [dm_mod]\n  __submit_bio+0x76/0x120\n  submit_bio_noacct_nocheck+0xb6/0x2a0\n  flush_expired_bios+0x28/0x2f [dm_delay]\n  process_one_work+0x1b4/0x300\n  worker_thread+0x45/0x3e0\n  ? rescuer_thread+0x380/0x380\n  kthread+0xc2/0x100\n  ? kthread_complete_and_exit+0x20/0x20\n  ret_from_fork+0x1f/0x30\n  \u003c/TASK\u003e\n Modules linked in: brd dm_delay dm_raid dm_mod af_packet uvesafb cfbfillrect cfbimgblt cn cfbcopyarea fb font fbdev tun autofs4 binfmt_misc configfs ipv6 virtio_rng virtio_balloon rng_core virtio_net pcspkr net_failover failover qemu_fw_cfg button mousedev raid10 raid456 libcrc32c async_raid6_recov async_memcpy async_pq raid6_pq async_xor xor async_tx raid1 raid0 md_mod sd_mod t10_pi crc64_rocksoft crc64 virtio_scsi scsi_mod evdev psmouse bsg scsi_common [last unloaded: brd]\n CR2: 0000000000000000\n ---[ end trace 0000000000000000 ]---"
        }
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      "providerMetadata": {
        "dateUpdated": "2025-09-18T13:33:03.439Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/732cd66ec19a17f2b9183d7d5b7bdb9c39b0776e"
        },
        {
          "url": "https://git.kernel.org/stable/c/cf06b162f5b6337b688072a1a47941280b8f7110"
        },
        {
          "url": "https://git.kernel.org/stable/c/b5be563b4356b3089b3245d024cae3f248ba7090"
        },
        {
          "url": "https://git.kernel.org/stable/c/384ef33d37cefb2ac539d44597d03f06c9b8975c"
        },
        {
          "url": "https://git.kernel.org/stable/c/ae7793027766491c5f8635b12d15a5940d3b8698"
        },
        {
          "url": "https://git.kernel.org/stable/c/91bd504128a51776472445070e11a3b0f9348c90"
        },
        {
          "url": "https://git.kernel.org/stable/c/842f222fc42a9239831e15b1fd49a51c546902cb"
        },
        {
          "url": "https://git.kernel.org/stable/c/97ce99984be12b9acb49ddce0f5d8ebb037adbb6"
        },
        {
          "url": "https://git.kernel.org/stable/c/341097ee53573e06ab9fc675d96a052385b851fa"
        }
      ],
      "title": "md: fix a crash in mempool_free",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50381",
    "datePublished": "2025-09-18T13:33:03.439Z",
    "dateReserved": "2025-09-17T14:53:06.996Z",
    "dateUpdated": "2025-09-18T13:33:03.439Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50381\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-18T14:15:36.873\",\"lastModified\":\"2025-09-19T16:00:46.437\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmd: fix a crash in mempool_free\\n\\nThere\u0027s a crash in mempool_free when running the lvm test\\nshell/lvchange-rebuild-raid.sh.\\n\\nThe reason for the crash is this:\\n* super_written calls atomic_dec_and_test(\u0026mddev-\u003epending_writes) and\\n  wake_up(\u0026mddev-\u003esb_wait). Then it calls rdev_dec_pending(rdev, mddev)\\n  and bio_put(bio).\\n* so, the process that waited on sb_wait and that is woken up is racing\\n  with bio_put(bio).\\n* if the process wins the race, it calls bioset_exit before bio_put(bio)\\n  is executed.\\n* bio_put(bio) attempts to free a bio into a destroyed bio set - causing\\n  a crash in mempool_free.\\n\\nWe fix this bug by moving bio_put before atomic_dec_and_test.\\n\\nWe also move rdev_dec_pending before atomic_dec_and_test as suggested by\\nNeil Brown.\\n\\nThe function md_end_flush has a similar bug - we must call bio_put before\\nwe decrement the number of in-progress bios.\\n\\n BUG: kernel NULL pointer dereference, address: 0000000000000000\\n #PF: supervisor write access in kernel mode\\n #PF: error_code(0x0002) - not-present page\\n PGD 11557f0067 P4D 11557f0067 PUD 0\\n Oops: 0002 [#1] PREEMPT SMP\\n CPU: 0 PID: 73 Comm: kworker/0:1 Not tainted 6.1.0-rc3 #5\\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014\\n Workqueue: kdelayd flush_expired_bios [dm_delay]\\n RIP: 0010:mempool_free+0x47/0x80\\n Code: 48 89 ef 5b 5d ff e0 f3 c3 48 89 f7 e8 32 45 3f 00 48 63 53 08 48 89 c6 3b 53 04 7d 2d 48 8b 43 10 8d 4a 01 48 89 df 89 4b 08 \u003c48\u003e 89 2c d0 e8 b0 45 3f 00 48 8d 7b 30 5b 5d 31 c9 ba 01 00 00 00\\n RSP: 0018:ffff88910036bda8 EFLAGS: 00010093\\n RAX: 0000000000000000 RBX: ffff8891037b65d8 RCX: 0000000000000001\\n RDX: 0000000000000000 RSI: 0000000000000202 RDI: ffff8891037b65d8\\n RBP: ffff8891447ba240 R08: 0000000000012908 R09: 00000000003d0900\\n R10: 0000000000000000 R11: 0000000000173544 R12: ffff889101a14000\\n R13: ffff8891562ac300 R14: ffff889102b41440 R15: ffffe8ffffa00d05\\n FS:  0000000000000000(0000) GS:ffff88942fa00000(0000) knlGS:0000000000000000\\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n CR2: 0000000000000000 CR3: 0000001102e99000 CR4: 00000000000006b0\\n Call Trace:\\n  \u003cTASK\u003e\\n  clone_endio+0xf4/0x1c0 [dm_mod]\\n  clone_endio+0xf4/0x1c0 [dm_mod]\\n  __submit_bio+0x76/0x120\\n  submit_bio_noacct_nocheck+0xb6/0x2a0\\n  flush_expired_bios+0x28/0x2f [dm_delay]\\n  process_one_work+0x1b4/0x300\\n  worker_thread+0x45/0x3e0\\n  ? rescuer_thread+0x380/0x380\\n  kthread+0xc2/0x100\\n  ? kthread_complete_and_exit+0x20/0x20\\n  ret_from_fork+0x1f/0x30\\n  \u003c/TASK\u003e\\n Modules linked in: brd dm_delay dm_raid dm_mod af_packet uvesafb cfbfillrect cfbimgblt cn cfbcopyarea fb font fbdev tun autofs4 binfmt_misc configfs ipv6 virtio_rng virtio_balloon rng_core virtio_net pcspkr net_failover failover qemu_fw_cfg button mousedev raid10 raid456 libcrc32c async_raid6_recov async_memcpy async_pq raid6_pq async_xor xor async_tx raid1 raid0 md_mod sd_mod t10_pi crc64_rocksoft crc64 virtio_scsi scsi_mod evdev psmouse bsg scsi_common [last unloaded: brd]\\n CR2: 0000000000000000\\n ---[ end trace 0000000000000000 ]---\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/341097ee53573e06ab9fc675d96a052385b851fa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/384ef33d37cefb2ac539d44597d03f06c9b8975c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/732cd66ec19a17f2b9183d7d5b7bdb9c39b0776e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/842f222fc42a9239831e15b1fd49a51c546902cb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/91bd504128a51776472445070e11a3b0f9348c90\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/97ce99984be12b9acb49ddce0f5d8ebb037adbb6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ae7793027766491c5f8635b12d15a5940d3b8698\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b5be563b4356b3089b3245d024cae3f248ba7090\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cf06b162f5b6337b688072a1a47941280b8f7110\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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